Transmission range 10 metersFunction Call function, voice control, support musicCustom processing: YesLOGO can be printedBluetooth protocol 4.1StereoHow to use LavalierWhether single or double ear, bilateral stereoColor Type A: Black [exquisite packaging] Type B: gray [exquisite packaging] Type C: red [exquisite packaging] Type D: second generation lavalier headset (black) E type: second generation lavalier headset (white)
